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Lines of Credit and Long-Term Debt - Lines of Credit (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Mar. 05, 2019
Dec. 31, 2018
Lines of Credit              
Trailing period         12 months    
2015 Revolving Line              
Lines of Credit              
Maximum borrowing capacity           $ 60,000  
Sublimit of loan           $ 1,000  
Unrestricted cash and unused availability balance $ 1,500   $ 1,500        
Trailing period         12 months    
Letter of credit outstanding 300   300       $ 300
Aggregate borrowings outstanding 0   0       $ 45,000
Amounts available for borrowings $ 59,700   $ 59,700        
Interest rate (as a percent) 5.58% 5.07% 5.58% 5.07%      
Interest expense $ 0 $ 67 $ 351 $ 67      
Deferred financing costs 638   638        
Amortization of deferred financing costs to interest expense 61 $ 20 $ 109 $ 41      
Aggregate borrowings outstanding during the period $ 0            
2015 Revolving Line | Prime Rate              
Lines of Credit              
Floor rate (as a percent)     3.50%        
Minimum | 2015 Revolving Line              
Lines of Credit              
Leverage ratio     1.00        
Minimum EBITDA (as a percent)     75.00%        
Minimum | 2015 Revolving Line | Prime Rate              
Lines of Credit              
Spread on variable rate (as a percent)     (0.25%)        
Maximum | 2015 Revolving Line              
Lines of Credit              
Leverage ratio     2.50        
Maximum capital expenditure     $ 5,000        
Maximum | 2015 Revolving Line | Prime Rate              
Lines of Credit              
Spread on variable rate (as a percent)     0.25%